Translucent screen for projected picture



9. DALE TRANSLUCENT SCREEN FOR PROJECTED PICTURES Sum 21 W271,

Filed April 29, 1925 Yellow-231 12 3 Patented June 21, 1927.:

UNITED STATES PATENT OFFICE.

CSWALD DALE, 013 NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE ACME WIRE CO.,

OF NEW HAVEN, CONNECTICUT, A CORPORATION.

TBANSLUCENT SCREEN FOB PROJECTED PICTURE.

Application filed April 29, 1925. Serial No. 28,579.

Fig. l is a plan view of a screen embodymg my invention.

Fig. 2 is a schematic face view with a section untreated.

Fig. 3 is a schematic transverse sectional view on the line 3-3 of Fig. 2.

My invention relates to an improvement in translucentscreens for projected pictures, the object being to produce a screen fabrihi'cated with particular reference to securing sharper images and to preserving color values than has been possible with the screens of the prior art. With these ends in view, my invention consists in a translucent screen for projected pictures, the said screen being composed of silk warp and weft threads proportioned in width and spaced in Weaving'to present', in' a given area of fabric, an area of silk greater than the aggregate area of the interstices between the threads, and a vegetableoil impregnating-compound. In carrying out my invention, as herein shown, the fabric is composed of warp threads 5 and weft threads 6 crossing each W other at right angles, with minute interstices 7 between them, the width of the threads 5 and 6 in any given piece of silk considerably exceeding the size of the interstices between the threads, so that, in any so given area of screen, the aggregate area of I all the threads is in excess of the aggregate area of .all of the interstices, whereby the silk is the dominatin factor in the surface of the fabric, rather t an the spaces between 85 them,. which has been the characteristic of translucent screens for projected pictures as heretofore made. Such a fabric is given a bluish tint by dyes, and then impregnated in a ve etable-oll compound 8, preferably of a ye lowish color, so that the ultimate screen fabric resulting from the bluetinted silk and ellow oil is of a neutral greenish color, WlllCll I find to be exceedingly advan-.

tageous in the production of pro ected pictures, since it gives substantially unaltered color values. I do not, however, limit myself to any color scheme. I

My "1m roved screen as'thus constructed depends or its picture-reproducing quali-.

ties on the well-known light-diffusing qualithe relatively wide-meshed fabrics employed has been to imprison and sup ort the gelatin body of the screen, which has usually 6 been corru ated to secure some measure of diffusion 0 light. 4

Another remarkable feature of my discovery is that the ictures projected through the screen may e seen with extraordinary definition at very acute angles with respect to the plane of the screen, whereas, in the prior art, beyond a certain angle, the picture became invisible. Still another remarkable feature of my discovery is that the pictureprojected u on the screen clearly appears upon the side thereof toward the proectmg machine, as well as upon its forward side, which is toward the observer, enabling the operator'to focus his pictures upon the screen With the maximum of accuracy and convenience, without leaving his position at the machme, whereas, in using the screens of the prior art, he has been obliged to 0 around to the front side of the screen to 0 s5 serve the focus and to repeat these trips between the machine and the front of the screen until he at length hits upon the right focus. That old method entailed not only a very considerable loss of time, but was arduous and failed of securing the precision of focus necessary to the best results. Thisv uahty of my improved screen offlshowing t e picture with equal clearness on both sides I attribute to the ower of difl'using light inherent in every n timate strand of silk, as ex lained above.

claimz' As a new article of manufacture, a translueent screen forprojected pictures, the said screen comprising warp and weft silk threads table compound of a complementary tint, so

proportioned in width and spaced in weavthat the resulting screen is of a tint which mg so that the area of silk, m a given area will preserve color values.

of fabric, is in excess of the aggregate area. In testimony whereof, I have signed this i of the interstices between the threads, the specification.

natural color of the silk bein tinted with one color and then impregnate with a vege- OSWALD DALE. 

